γδ T 细胞:γδ TCR不需与MHC分子结合,不需抗原提呈细胞的提呈,可直接识别并结合抗原分子,不存在Naive和memory状态,只有effector状态。在健康的成人中,γδ T 细胞主要分布于肠道、呼吸道以及泌尿生殖道等黏膜和皮下组织。根据免疫微环境既可促炎也可抗炎,同时具有先天免疫和适应性免疫特点。
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